As reported in https://github.com/mongodb-labs/mongo-arrow/issues/82 and https://github.com/mongodb-labs/mongo-arrow/issues/96, Windows users have had some trouble using our wheels. This is because by default libbson builds in "Debug" mode, which uses the debug versions of Windows system dlls. When those debug system dlls are not present, Python gives an opaque ImportError.

This problem was discovered by using https://github.com/lucasg/Dependencies on the produced assets in the wheel.